Electric lamp



Sept. 7, 1954 M. M. CAMILLERAPP ELECTRIC LAMP 2 Shee ts-Sheet 1 FiledAug. 21, 1951 INVENTOR. WM mm Sept. 7, 1954 M. M. CAMILLERAPP ELECTRICLAMP 2 Sheets-Sheet 2 Filed Aug. 21 1951 INV ENTOR. "lWWMAw wfflPatented Sept. 7, 1954 UNITED STATES PATENT OFFICE 2,688,711 ELECTRICLAMP Marcel Marie Camillerapp, Petit Quevilly, France Application August21, 1951, Serial No. 242,900

Claims. (Cl. 313--276) The object of the present invention is animprovement to incandescent electric lamps, the purpose of suchimprovement being to preserve the filament against shocks,trepidationsor vibrations.

According to a first characteristic of the invention, a unit presentinga certain mass and constituted by the filament, its holding wires and aninsulating holder, is fixed at the free end of two or several flexiblewires stems, the other end of which is fixed in the lamp base, some onesof these Wires stems being liable to be used as conductors forconnecting the filament to the source of voltage.

According to another characteristic of the invention, some wire stemscan be made of an e1as-' v tic metal, other ones being constituted of anon elastic metal able to produce a damping of vibrations.

According to a further characteristic of the invention, the wire stemscan be nearly rectilinear or be folded or bent, for example like azigzag or a helix, so as to be endowed of a great flexibility with smalloverall dimensions.

The invention will be better understood with the help of the followingdescription, with reference to the annexed drawings, in which:

Figure 1 shows in perspective an example of a lamp according to theinvention.

Figure 2 represents in elevation a unit similar to that of Figure 1,fixed upon two flexible wire stems welded into the base according to theinvention.

Figure 3 shows a first modified embodiment in which the wire stemsarerolled in zigzag, and

Figure 4 shows a second modified embodiment in which the wire stems areWound as a helix.

- Referring at first to Figure 1, an insulating rod is seen in I,including three beads 2, 3, 4; the molybdenum hooks 5 commonly used tohold the filament 6, are pricked into the bead 2. Theinput connectionswhich hold the filament ends are constituted by metallic arms I and 8having a certain stiffness; they are pricked into the bead 3 and may bebent as shown in the figure, in order to bring their free end in thefilament plane. In this bead 3, another arm 9 is also provided which isalso connected to a convenient point on fila ment 6. In thisarrangement, the lamp may work with two different current intensities orbe fed with polyphase current. Additional fixing arms 20, 2 I, and 22are connected to bead 4 and project therefrom. In this embodiment, threewire stems 23, 24, and 25 are provided which are fastened at their lowerends in base I2, and connected at H their upper ends respectively tofixing arms 20, 2|, and 22 and arms I, 8, and 9. In the embodimentshown, the sealings of the three wire stems in base I 2 are arranged ina straight line, but these sealings may be otherwise arranged such as intriangular form.

The Figure 1 embodiment is of particular value in the case of ratherpowerful lamps. In this way, a triangular arrangement is obtained, whichfrom a mechanical point of view is endowed with all the advantagesbelonging to that geometrical form, particularly an overall elasticitymore symmetrical with respect to the lamp axis.

In Figure 2 is shown the device for fastening the filament support. Theexample represented refers to an embodiment in which two wire stems Itand I I are used simultaneously as electrodes; they are inserted intothe pinched part 12 of the glass foot in a known manner, and arefastened by tightening or welding in i3 and I4 on the holding arms I5and I6; the arms I? and I8 pricked into the bead l9 are also joined bywelding or any other means to the wire stems If! and I respectively. Thefastening of the filament support is so secured as to prevent it fromrocking about the points I3 and M.

The filament support is so fastened at the end of a flexible unit, themetallic wire stems I0 and II being elastic, and this device produces adamping of the vibrations which occur perpendicularly to the lamp axis.

The above described arrangements are generally convenient, namely forlamps whose dimensions are ratherimportant. However, they are not asWell adapted to lamps of reduced power or to those which, by theirpurpose, should present limited overall dimensions. The modified typesaccording to Figures 3 and 4 can then be used.

Referring at first to Figure 3, a lamp is seen in perspective, whoseglass bulb is in I and the cap is in 2. Two metallic wires 5 and 6folded like a zigzag as shown, are sealed in the pinched part 4 of thebase; two conducting angle arms I and 8 are fixed, for example bywelding, at their respective ends; besides these arms are pricked in thefirst bead 9 of a stem II), the latter being made of a plasticinsulating material such as glass. The free ends of these angle wiressupport the ends of the filament I3 maintained inproper position byholding wires I2 pricked into a second bead I I of the stem II]. Thewire stems 5 and 6 extend through the foot by conductors l4 and I5which, according to the usual arrangement are ending to contactterminals I6 and I1.

Referring to Figure 4, the same elements are seen as in Figure 3, andpointed out by the same reference numbers, but the wire stems 5 and 6are rolled like a helix, the general arrangement remaining the same.

It is easy to understand the advantages of the modified embodimentaccording to Figures 3 and 4. In the arrangements represented in bothfigures, the units constituted by the stem 10, the angle wires I and 8,the filament l3 and its holding wires [2, present a certain mass whichis supported by the wire stems 5 and 6; the latter, by reason of theirshape, have a great flexibility; however, the encumbrance in length,along the axis of the lamp, is very reduced.

It is understood that the constructional forms represented, constituteonly examples. The wire stems 5 and 6 might be folded or rolled in othercurves than those shown, according to the requirements of themanufacture or of the use.

Moreover the details of making could vary. The lamp cap, the shape ofthe arms 7 and 8 as well as the various attaching or welding ways may beany method whatever. The connections 14 and 45 may be the extensions ofthe wire stems 5 and 6 themselves, or conductors added and welded in anypoint whatever of these wire stems; the latter ones might also act onlyas mere holders, the current being fed to the filament through auxiliaryconductors.

A number of Wire stems 56 different from two, might also be used, as inthe embodiment of Figure 2; for example, three'might be provided, someof them might be made of a nonelastic annealed metal, in order to dampthe oscillations.

It is obvious that the nature of the materials used should be chosenaccording to the usual requirements of the technics. The folded orrolled wire stems could be, for example, of nickel, molybdenum ortungsten; steel wires could also be used, preferably nickeled or chromedif the lamp contains a gaseous atmosphere, so as to avoid everycontamination of the gas.

What I claim is:

1. An incandescent lamp comprising, in combination, a glass bulb; a stemarranged in the walls of said glass bulb; at least three metallicflexible wire rods seal d at one end thereof to said stem; an insulatingsupport mounted at the other ends of said flexible metallic wire rods soas to be carried thereby; two metallic arms supported by said insulatingsupport and connected to two of said wire rods, said arms consisting ofmetal and being rigid; a plurality of hooks supported by said insulatingsupport; and a filament having two ends electrically and mechanicallyconnected to said arms, respectively, said filament being arranged so asto traverse said hooks supporting the same whereby said filament, saidarms and said hooks form a unit to which current is supplied by said twowire rods and which is supported by said insulating support.

2. An incandescent lamp comprising, in combination, a glass bulb; a stemarranged in the walls of said glass bulb; at least three metallicflexible wire rods sealed at one end thereof to said stem; an insulatingsupport mounted at the other ends of said flexible metallic wire rods soas to be carried thereby; two metallic arms supported by said insulatingsupport and connected to two of said wire rods, said arms consisting ofmetal and being rigid; a plurality of hooks supported by said insulatingsupport; and a filament having two ends electrically and mechanicallyconnected to said arms, respectively, said filament being arranged so asto traverse said hooks supporting the same whereby said filament, saidarms and said hooks form a unit to which current is supplied by said twoWire rods and which is supported by said insulating support, at leastone of said wire rods consisting of an elastic metal whereas the otherof said wire rods consists of a nonelastic metal.

3. A lamp as claimed in claim 1, said glass bulb being gas-fi11ed; and ametallic layer arranged on said wire rods, said metallic layerprotecting said wire rods against the chemical action of the gas fillingsaid glass bulb.

4. An incandescent lamp comprising, in combination, a glass bulb; a stemarranged in the walls of said glass bulb; at least three metallicflexible wire rods sealed at one end thereof to said stem; an insulatingsupport mounted at the other ends of said flexible metallic wire rods soas to be carried thereby; a plurality of metallic arms supported by saidinsulating support and connected to a plurality of said wire rods, saidarms consisting of metal and being rigid; a plurality of hooks supportedby said insulating support; and a filament electrically and mechanicallyconnected to said arms, respectively, said filament being arranged so asto traverse said hooks supporting the same whereby said filament, saidarms and said hooks form a unit to which current is supplied by at leasttwo of said wire rods and which is supported by said insulating support.

5. An incandescent lamp comprising, in combination, a glass bulb; a stemarranged in the walls of said glass bulb; at least three metallicflexible wire rods sealed at one end thereof to said stem; an insulatingsupport mounted at the other ends of said flexible metallic wire rods soas to be carried thereby; a plurality of metallic arms supported by saidinsulating support and connected to a plurality of said wire rods, saidarms consisting of metal and being rigid; a plurality of hooks supportedby said insulating support; and a filament electrically and mechanicallyconnected to said arms, respectively, said filament being arranged so asto traverse said hooks supporting the same whereby said filament, saidarms and said hooks form a unit to which current is supplied by said atleast two of wire rods and which is supported by said insulatingsupport, at least one of said wire rods consisting of an elastic metalwhereas another of said wire rods consists of a nonelastic metal.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,856,247 Gustin May 3, 1932 2,238,598 Powell Apr. 15, 19412,497,566 Stone Feb. 14, 1950

